Mahonia plant named ‘NCMH2’

ABSTRACT

‘NCMH2’ is a new cultivar of  Mahonia  with a compact habit, narrow evergreen foliage, showy red and yellow flowers and red new foliage color.

Latin name of the genus and species: The Latin name of the novel, ornamental plant variety disclosed herein is Mahonia.

Variety denomination: The inventive cultivar of Mahonia disclosed herein has been given the varietal denomination ‘NCMH2’.

BACKGROUND OF THE INVENTION

The present invention comprises a new and distinct Mahonia cultivar hereinafter referred to by the cultivar name ‘NCMH2’. This new Mahonia, ‘NCMH2’, was selected from a population of seedlings grown from an open-pollinated hybrid NCSU H2009-018-063 (unpatented). The first asexual propagation of ‘NCMH2’ was carried out in December 2014 by rooting stem cuttings in Mills River, N.C. and has been asexually reproduced repeatedly by vegetative cuttings over a 5-year period. ‘NCMH2’ roots from semi-hardwood and hardwood cuttings were treated with a basal dip of 6,000-10,000 ppm indole butyric acid (potassium salt) in water. ‘NCMH2’ has been found to retain its distinctive characteristics through successive asexual propagations.

SUMMARY OF THE INVENTION

‘NCMH2’ is distinguishable from other Mahonia cultivars, when grown under standard horticultural practices in Mills River, N.C., by its compact habit; narrow, evergreen foliage; showy racemes with multicolored flowers that bloom sporadically throughout fall, winter, and spring; and showy red new foliage.

BRIEF DESCRIPTION OF THE DRAWINGS

This new Mahonia is illustrated by the accompanying photographs which show the plant's form, foliage and inflorescences. The colors shown are as true as can be reasonably obtained by conventional photographic procedures. Colors in the photographs may differ slightly from the color values cited in the detailed botanical description, which accurately describe the colors of the new Mahonia.

FIG. 1 is a color photograph of a typical specimen of a 3-year-old Mahonia ‘NCMH2’ grown under standard horticultural practices showing the inflorescences of ‘NCMH2’ taken in October 2019 in Mills River, N.C.

FIG. 2 is a color photograph of a typical specimen of Mahonia ‘NCMH2’ grown under standard horticultural practices showing the flowers, habit, and new foliage color of a two-year old plant of ‘NCMH2’ growing in Arden, N.C. and taken in March 2019.

DETAILED BOTANICAL DESCRIPTION

Although Mahonia species are sometimes classified as Berberis, the most recent taxonomic treatment by Yu and Chung Taxon 66(6):1371-1392 (2017) classifies Mahonia and Berberis as separate genera. The following is a detailed description of the botanical characteristics of the new and distinct Mahonia variety plant known by the denomination ‘NCMH2’. All colors cited herein refer to The Royal Horticultural Society Colour Chart designations (The Royal Horticultural Society (R.H.S.), London, Sixth Edition (2016). Where specific dimensions, sizes, colors, and other characteristics are given, it is to be understood that such characteristics are approximations or averages set forth as accurately as practicable.

The detailed descriptions reported herein were taken in 2019 from a three-year-old container-grown plant that was grown in Mills River, N.C. under standard horticultural practices. Mahonia ‘NCMH2’ has not been observed under all possible environmental conditions; therefore, the phenotype may vary under different environmental conditions such as season, temperature, light intensity, day length, cultural conditions, and the like, without however, any variance in the genotype.

TECHNICAL DESCRIPTION OF THE VARIETY

-   Classification:     -   -   Botanical name.—Mahonia ‘NCMH2’.         -   Common name.—Mahonia.         -   Variety name.—‘NCMH2’. -   Parentage: Selected from a population of seedlings grown from an     open-pollinated hybrid, NCSU H2009-018-063 (unpatented). The female     parent, H2009-018-063, is a complex hybrid that includes Mahonia     eurybracteata, M. gracilipes, M. japonica, and M. lomariifolia in     its pedigree. -   Plant description:     -   -   Growth habit.—Compact and upright shrub.         -   Growth rate.—Moderate.         -   Height.—About 100 cm.         -   Width.—About 60 cm. -   Roots:     -   -   Type.—Fibrous.         -   Root color.—Moderate Yellow (RHS 160A). -   Shoot and stem:     -   -   Lateral branch length.—Average is ˜28 cm (˜18 cm to ˜44 cm).         -   Lateral branch diameter.—Average is ˜0.8 cm (˜0.5 cm to ˜1.2             cm).         -   Internode length.—Average is ˜5.4 cm (˜3 cm to ˜7.5 cm).         -   Immature shoot texture (current year).—Glabrous.         -   Immature shoot color (current year).—Yellow-Green (RHS             144A).         -   Mature stem texture (from prior year).—Glabrous with             vertical fissures.         -   Mature stem color (from prior year).—Grey-Brown (RHS N199B). -   Leaves:     -   -   Type.—Compound, odd-pinnate.         -   Persistence.—Evergreen.         -   Leaf fragrance.—None.         -   Leaf arrangement.—Alternate.         -   Leaf length.—Average is ˜28 cm (˜22 cm to ˜34 cm).         -   Leaf width.—Average is ˜11 cm (˜8 cm to ˜17 cm).         -   Rachis.—Length: Average is ˜17 cm (˜12 cm to ˜22 cm). Width:             About 0.2 cm. Color: Upper side Purple (RHS N77A), lower             side Yellow-Green (RHS 144A). Texture: Glabrous.         -   Leaflet.—Arrangement: Opposite with a longer terminal             leaflet. Number: 9 to 13 leaflets. Shape: Lanceolate. Apex:             Long acuminate. Base: Cuneate. Venation: 3-nerved. Margins:             Infrequently serrulate with 6 to 9 teeth. Sub-terminal             leaflet length: Average is ˜7.3 cm (˜5 cm to ˜11 cm).             Sub-terminal leaflet width: Average is ˜1.9 cm (˜1 cm to             ˜2.5 cm). Terminal leaflet length: Average is ˜12.3 cm (˜10             cm to ˜17 cm). Terminal leaflet width: Average is ˜2.2 cm             (˜1.4 cm to ˜2.6 cm). Color: Emerging foliage, upper and             lower surface: Strong Purplish Red (RHS 64C). Mature             foliage, upper surface: Green (RHS 137A). Mature foliage,             lower surface: Yellow-Green (RHS 146C). Texture: Glabrous.             Attachment: Sessile.         -   Leaf attachment.—Petiolate.         -   Petiole.—Length: Average is ˜1.4 cm (˜0.7 cm to ˜2.6 cm).             Diameter: About 0.2 cm. Color: Yellow-Green (RHS 144A), both             upper and lower surface. Texture: Glabrous. -   Inflorescence:     -   -   Description.—Single flowers arranged on terminal racemes,             opening from base to apex.         -   Number of racemes per terminal.—Average is ˜8 (4 to 12).         -   Number of flowers per raceme.—30 to 50.         -   Flowering season.—October to March, sporadically, in Mills             River, N.C.         -   Fragrance.—None.         -   Lastingness.—2 to 6 weeks.         -   Inflorescence.—Length: Average is ˜12.3 cm (˜10 cm to ˜14             cm). Width: Average is ˜1.8 cm (˜1.5 cm to ˜2.0 cm).         -   Flower.—Height: Average is ˜0.5 cm (˜0.5 cm to ˜0.6 cm).             Diameter: Average is ˜1.4 cm (˜1.3 cm to ˜1.6 cm).             Lastingness: 3 to 7 days.         -   Bud.—Shape: Rounded. Diameter, early stage: About 0.2 cm.             Diameter, balloon stage: About 0.5 cm. Color, early stage:             Vivid Reddish Orange (RHS 42A) with some Vivid Yellow (RHS             17C) and some Strong Reddish Purple (RHS 72B) towards the             base. Color, balloon stage: Vivid Reddish Orange (RHS 42A)             with increasing amounts of Vivid Yellow (RHS 17C) and some             Strong Reddish Purple (RHS 72B) towards the base. Texture:             Glabrous.         -   Petals.—Number: 6. Arrangement: Whorled. Length: ˜0.5 cm.             Width: ˜0.3 cm. Shape: Ovate. Margin: Entire. Apex: Rounded.             Base: Truncate. Color: Yellow (RHS 8A). Texture: Glabrous.         -   Sepals.—Number: 9, consisting of 6 petaloid sepals and 3             true sepals. Arrangement: Whorled. Petaloid sepals: Length:             About 0.8 cm. Width: About 0.3 cm. Shape: Oblong. Margin:             Entire. Apex: Obtuse. Base: Rounded. Color, inner surface:             Yellow (RHS 8B). Color, outer surface: Yellow (RHS 8B) with             some Vivid Reddish Orange (RHS 42A). Texture: Glabrous. True             sepals: Length: About 0.5 cm. Width: About 0.3 cm. Shape:             Ovoid. Margin: Entire. Apex: Acute. Base: Rounded. Color:             Strong Reddish Purple (RHS 72B) at tips and Strong Purplish             Red (RHS 63B) at base, both surfaces. Texture: Glabrous.         -   Peduncle.—Length: Average is ˜12.4 cm (˜6 cm to ˜15 cm).             Diameter: About 0.1 cm. Color: Greyed-Red (RHS 181C).             Texture: Glabrous.         -   Pedicels.—Length: About 0.4 cm. Diameter: Less than 0.1 cm.             Color: Greyed-Red (RHS 181C). Texture: Glabrous. -   Reproductive organs:     -   -   Gynoecium.—Pistil number: 1. Pistil length: ˜0.4 cm. Stigma             shape: Round. Stigma color: Green-Yellow (RHS 1D). Style             length: ˜0.3 cm. Style color: Green-Yellow (RHS 1D).         -   Androecium.—Stamen number: 6. Stamen shape: Linear. Stamen             length: About 0.4 cm. Anther shape: Two-lobed. Anther size:             About 0.1 cm. Anther color: Yellow (RHS 7A). Amount of             pollen: Moderate. Pollen color: Green-Yellow (RHS 1D). -   Fruit and seed:     -   -   Fruit type.—Berry. Shape: Ovoid. Length: Average is ˜0.6 cm             (˜0.4 cm to ˜0.8 cm). Width: Average is ˜0.4 cm (˜0.3 cm to             ˜0.7 cm). Color: Greyed-Purple (RHS N186A). Texture:             Glabrous, pruinose.         -   Seed.—Number: 1 to 2 per berry. Shape: Ovoid. Length: About             0.5 cm. Width: About 0.3 cm. Color: Yellow-Green (RHS 144C).             Texture: Glabrous. -   Disease and insect resistance: No significant disease or insect     pests have been observed. -   Cold hardiness: At least USDA zone 7A; testing has not been     completed in colder zones.

COMPARISON WITH PARENTAL SPECIES

‘NCMH2’ is distinguished from Mahonia x media ‘Winter Sun’ in that ‘NCMH2’ has multicolored flowers of red (RHS 42A) and yellow (RHS 8B), whereas Mahonia x media ‘Winter Sun’ has yellow (RHS 7B) flowers. ‘NCMH2’ is distinguished from Mahonia ‘Soft Caress’ (U.S. Plant Pat. No. 20,183) in that ‘NCMH2’ has wider evergreen sub-terminal leaflets (about 1.9 cm in width) with reddish (RHS 64C) new growth, whereas Mahonia ‘Soft Caress’ (U.S. Plant Pat. No. 20,183) has narrower evergreen subterminal leaflets (about 0.4 to 0.8 cm in width) and green (RHS 144A) leaflets. ‘NCMH2’ also has racemes of multicolored flowers, whereas M. ‘Soft Caress’ has yellow (RHS 8A) flowers. 

What is claimed is:
 1. A new and distinct Mahonia plant named ‘NCMH2’ as illustrated and described herein. 